Rotary engine



'(-NO Model.)

` D. D. HARDY; J ROTARY ENGINE.

inventor,

l/dy,

` UNTED STATES @PATENT OFFICE.

DEXTER D. HARDY, OF HAVANA, ASSIGNOR TO THE HARDY ROTARY ENGINE COMPANY, OF CHICAGO, ILLINOIS.

ROTARYLENGINE.

SPECIFICATION forming part of Letters Patent No.V 260,678, dated July 4, 1882. v Application filed November 29, lttl.Y (No model.)

To all whom it may concern.'

Be it known that I, DEXTER D. HARDY, of Havana, in the county of Mason, in the State of Illinois, have invented an Improved Rotary Engine; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the annexed drawings, making a part of this specification, in which like letters of reference refer to like parts, and in which- Figure l represents a side elevation with the head M removed; Fig. 2, a sectional view through center; Fig. 3, view of head M with the part in front of :n broken away.

This en gine is an improvement over one patented by meNovembcr 14, 1876, No. 184,284.

S is the outer case or shell, and is provided with the heads H and M.

The internally-toothed cylinder A is immovably fastened to the disk D. Said disk D" is keyed to the shaft F', which passes through suitable bearings and packing at the center of the head H. Said cylinderA is furnished with three extra-sized teeth or lugs T, placed at equal Vdistances apart. .Said cylinder A is made smaller in diameter than the inside of said shell S, and three or more ribs, R, are made upon the outside of said cylinder, so that it will just lit said shell. One`or two holes, J, are drilled through this cylinder A between the ribs R. The pinion B, made two-thirds of the diameter of said cylinder A,`measuring on the pitch lines, has made in it two recesses, lE E, to receive the lugs T, and is keyed to the shaft F. This shaft passes through suitable bearings and packing in the head M. The crescent C, made of just the right size to lill the space not swept over by the lugs T or the pinion B, is bolted at one end tothe head M. Within said head Mare cored out three cavities, K', G', and K', of the thickness shown in Fig. 2 and the dimensions shown in Fig. 3. K' K' open outwardly through the rectangular orifices K K into the steam-chest L and in through the ports K2 K2 at their other ends into the inside of the cylinder A. The cavity G' opens through the rectangular orifice G into the steam-chest L, and at its other extremity terminates in the exhaust-pipe G2. Over said openings K G K in the steam -chest L slides the cupshaped valve I, moved by a rod and lever. This valve I is for reversing and stopping the engine.

In the co-ncavesideof the crescent C is made a cavity fitted with a rectangular piece of metal, l?, pushed outward byasprin g. This is `to serve as a packing to prevent any steam from passing between the pinion B and the crescent C. In the same way the teeth T are provided with a packing consisting of a strip of steel pressed outward by a spring. A piu or two prevents saidstrip of steelfrom being pressedouttoo far. The operation ofthis engine is as follows: The valve I being drawn to one side, the steam enters through the open port K, cavity K', and port K2 into the space included between the one side of the pinion B, cylinder A, and lug T. The other side of the pinion B ybeing open to exhaust through the port K2, cavity K', and oriliceK at its side, and from thence through the hollow of the valve I through the oritice G, cavity G', and exhaustpipe G2, the lug T, at the side where the steamis entering, will be forced over toward the side of the exhaust-port. The Ycylinder A will therefore be kept revolving in the same direction by the pressure acting successively upon each lug T as it comes up into position. By shifting the valve I over to the other side the cylinderA is made to rotate in the opposite direction, and is held stationary when said valve is held at the center. Thepinion B is caused to revolve by the cylinder A in the same direction, but at a higher rate of speed. When the steam is letinto the engine it passes through the hole J into the space between the cylinder A and shell S, and thus prevents the friction that would otherwise result from the steam pressing saidcylinder against the shell S.

Theobject of having the cylinder A attached to the disk D is twofold: First, it takes up the end wear of the cylinder A, crescent C, and pinion `B against the head M by being pressed Vinward either by steam, springs, or by setscrews applied against a shoulder upon the shaft F', second, shaft F' can also be used from which to derive power. The shaft F will revolve more rapidly than F'; but'the latterA gives the most power. This makes my rotary engine valuable for use as a motor for streetcars. By means of clutch-pulleys, a lever F' is used to start the car' till it has got under headway, whenF is used instead. In going upgrade F' is also used in place of F.

' As I have previously obtained a patent upon IOO nearly the same machine, I do not claim the combination broadly; but

Vhat I do claim, and for which I desire Letters Patent, is as follows, to wit:

l. In a rotary engine, the combination of the internally-toothed cylinder A, having lugs T, ribs R, and holes J, with the disk D, shaft F', and the case S,substantially as and for the purpose set forth.

2. The combination, with the shell S, having heads H and M, of the internally-toothed cylinder A, having ribs It, holes J, and lugs .l, with strips of metal at their extremities pressed outwardly by springs, the crescent G, having metal packing P, and the pinion B, having recesses E, and shalt F, substantially as and for the purpose specified.

3. The internally-toothed cylinder A, having lugs T, dislt D, and shaft I1", the crescent C, bolted to the head M, the pinion B, having recesses E, and shaft F, iu combination with the shell S, head II, and head M, having system of ports K2 K2 K G K and cavities K G' K', substantially as and for the purpose herein set forth.

4. A rotary engine having an internallytoothed cylinder, A, made to revolve within a stationary outside shell, with recessesbetween said cylinder and said outside shell to receive steam through suitable passages from the inside of said cylinder, and for the purpose of counterbalancing the steam pressure on the insideot' said cyliuderand preventing the frietion that would otherwise result from the steam pressing said cylinderagainst the outside shell, substantially as specitied.

In testimony that I claim the foregoing invention I have hereunto set my hand this 16th day of November, 1881.

I) EXTER D. HARD Y.

Witnesses:

JAMEs WoLoo'rT, 1I. W. WELLS. 

